It Takes Time
I was 24 when both of my parents past away, six months apart. My mother lung cancer. My father gangerine (kidney dialesis: his cathider got infected.) That was 16 years ago. You will always miss them. Time will heal the pain in your heart. Eventually, you just remember the greatness of their lives and how much they bestowed in you, how much they loved and will always be loved. Try to remember to celebrate his life. He would want you to remember him with joy... not tears.
My deepest sympathy to you and your family.